(a) Give the criteria of essentiality of plant nutrients. List the essential mineral elements required in plant nutrition. State the principal functions of N, P, K, Ca, Mg and S (20 marks)

(b) Write the concept of soil moisture constraints. Write the role and availability of moisture to plants (15 marks)

2Medium20 marks

Discuss about the factors affecting the efficacy of herbicides.

3Medium13 marks

What is photoperiodism ? Write at least one example of shortday plant, longday plant and day neutral plant.

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